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Experimental results in charmonium decays from BES

This study presents experimental results on charmonium decays from BES, focusing on various decay processes including leptonic, radiative, hadronic decays, and more. The data samples outline ψ', χcJ decays, and other phenomena observed. Current findings and expected outcomes are discussed, alongside plans for future research using larger sample sizes. Results from BESII and CLEO-c experiments are examined, highlighting key observations and testing of theoretical predictions. The study aims to understand charmonium decay mechanisms and look for new physics phenomena within these decays. Join us in exploring the fascinating world of charmonium decays!

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Experimental results in charmonium decays from BES

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  1. Experimental results in charmonium decays from BES Rong-Gang Ping (presented by F. Harris) for BES collaboration Charm 2007 Aug. 6, 2007

  2. (2s) data samples outline • ’ decays • Leptonic decays • Radiative decays • Hadronic decays • cJ decays • VV • PPP 26M 14M 4M 3M Also 6.42 pb-1 of data at Ecm=3.65 GeV for background study.

  3. Expected? Sequential lepton hypothesis:

  4. BESII: remeasure with larger sample • Measured in     ee • Characterized by • 2 charged tracks; 1  and 1 e • missing energy and momentum • no extra hits in BSC  = 17.8%

  5. BESII    Result: B(  ) = (3.100.210.38) x 10-3 Lepton universality is tested in charmonium decays. PRD 74: 112003 (2006)

  6. ’ radiative decays PRL 99, 011802 (2007)

  7. Observation of ’ radiative decays • Expect ~1% BR, but only 0.05% previously observed. • Potential channels for hadron spectroscopy study, including search for non-qqbar states, if enough statistics. • ~ 0.1% more observed in this analysis. PRL99, 011802 (2007)

  8. PRD74, 072001 (2006).

  9. PRD74, 072001 (2006).

  10. MARK-II K*K ρπ

  11. x 10-4 x 10-4 Angular distribution: 2

  12. Baryonic decays Rich structure (N*s), statistics (~850 evts in each mode). Still low for a partial wave analysis. PRD74, 012004 (2006)

  13. Test I-spin symmetry (prediction: 1:2:2)

  14. PRL 99,011802 (2007)

  15. Pair production of vectors PLB642, 197 (2006) c0 c1 c2 Improved precision over PDG (BESI) results on cJKKKK and . First measurement of cJKK. cJ→2(K+K)

  16. c1 c2 cJ decays into PPP PRD74, 072001 (2006) cJ→KK and  c1→KSK+-+c.c. K* PRD 74, 072001 (2006) c0→PPP is suppressed by spin-parity selection;

  17. Nsig=418± 60 h c1→ +- Nsig=222±28 (8.8s) Nsig=58± 14 (4.5s) h sideband a0 sideband

  18. BES: cJ→KK and  PRD 74, 072001 (2006) CLEO-c, PRD75, 032002

  19. arXiv: 0707.1127 [hep-ex] Submitted to PRD ’(J/) +0/ • Is it really B(0)>B()? background from J/  ΣΛπ signal First measurement!

  20. Summary • ’ leptonic decays, hadronic decays, radiative decays are studied to search for new phenomena and to test QCD predictions. • c decays are studied using ’ data sample. • CLEOc will take the leading role in ’ and c decays; we are now preparing for the BESIII data taking and the physics analysis. Thanks a lot !

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